Make cookie dough: In a stand mixer, beat butter, sugar, and vanilla until smooth. Add flour and salt and beat until combined. Stir in chocolate chips.

Line an 8"-x-8" baking dish with parchment paper so there's an overhang. Transfer half the cookie dough to the parchment paper and pat down so it creates a thin even layer. Cover with another piece of parchment, leaving an overhang, and repeat with remaining cookie dough. Transfer to the freezer until firm, 2 hours.

Remove pan from freezer and separate layers of cookie dough. Cut into eight large squares.

Over a flame on the stove or under the broiler in an oven, toast marshmallows.

Sandwich chocolate and marshmallows in between two squares of cookie dough.

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